Double syringe



FIG. 1 is a perspective view of a double syringe showing my new design;

FIG. 2 is a leftside elevation;

FIG. 3 is a rear elevation;

FIG. 4 is a front elevation;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view. 

The ornamental design for a double syringe, as shown. 